"You always hear about these happening, but you never expect to be the recipient of it," Sarah Clark told CNN affiliate KHPO. "It's a huge, huge help for me and my family."

Clark, who is pregnant and due in January, said she wouldn’t be getting paid time off after her baby is born. The large amount came just in time for she and her fiancé, who is also about to undergo knee surgery, to use on bills.

"I couldn't believe what I was looking at first because it was such a high amount," she said. "Nine hundred dollars is a lot of money. It took a while for it to set in, and once it did I cried for a little while."

The woman who reportedly gave Clark the tip had spoken with her several times before and was also pregnant, according to CNN.

"I don't know if she really understands how much this is going to help us this season," Clark said. "Me being on maternity leave and him being out of work, we're not going to be making any income. So, this is really going to help with rent and other bills and things like that."

CNN reported that the woman also left Clark with one more bit of kindness, a nice note, written right on the receipt: "This is God's money -- He gave it to us so we could give it to you. God bless."